Optically, Te has one of the largest known second order nonlinearity (d = 600 pm/V) of any natural bulk material [1]}. The Kerr nonlinearity (\(n_{2}\) ) is not known, but band gap scaling [2]} suggests it can be very large, on the order of 10-100x that of GaAs. This third order nonlinearity is the main force behind SC generation, mediating effects such as self-phase modulation (SPM) four wave mixing (FWM), and stimulated Raman scattering (SRS). Therefore, measurements of SC spectra in Te can allow for an estimate of \(n_{2}\) . Characterization of Te's nonlinear optical properties are especially relevant due to renewed interest in the material; the unique crystal structure, consisting of helical chains along the c-axis weakly bound to each other in a hexagonal array, and its symmetries have been the topic of several recent studies on exotic magnetic [3]} and topological properties [4]}.
